Limits...
Evaluation of rockfish conservation area networks in the United States and Canada relative to the dispersal distance for black rockfish (Sebastes melanops).

Lotterhos KE, Dick SJ, Haggarty DR - Evol Appl (2013)

Bottom Line: We used isolation-by-distance theory to estimate the scale of dispersal from microsatellite data in the black rockfish, Sebastes melanops, and compared this estimate with the distance between RCAs that would protect this species.Within each country, we found that the distance between RCAs was generally within the confidence intervals of mean dispersal per generation.The distance between these two RCA networks, however, was greater than the average dispersal per generation.

View Article: PubMed Central - PubMed

Affiliation: Department of Zoology, University of British Columbia Vancouver, BC, Canada.

ABSTRACT
Marine reserves networks are implemented as a way to mitigate the impact of fishing on marine ecosystems. Theory suggests that a reserve network will function synergistically when connected by dispersal, but the scale of dispersal is often unknown. On the Pacific coast of the United States and Canada, both countries have recently implemented a number of rockfish conservation areas (RCAs) to protect exploited rockfish species, but no study has evaluated the connectivity within networks in each country or between the two countries. We used isolation-by-distance theory to estimate the scale of dispersal from microsatellite data in the black rockfish, Sebastes melanops, and compared this estimate with the distance between RCAs that would protect this species. Within each country, we found that the distance between RCAs was generally within the confidence intervals of mean dispersal per generation. The distance between these two RCA networks, however, was greater than the average dispersal per generation. The data were also consistent with a genetic break between southern Oregon and central Oregon. We discuss whether additional nearshore RCAs in southern Oregon and Washington would help promote connectivity between RCA's for shallow-water rockfishes.

No MeSH data available.


Contour lines represent the standard deviation of dispersal per generation, as a function of effective density and the Isolation by distance slope. The point estimates are shown for MIGRATE and ONeSAMP, and the gray area encompasses the 95% confidence intervals for both estimates.
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fig04: Contour lines represent the standard deviation of dispersal per generation, as a function of effective density and the Isolation by distance slope. The point estimates are shown for MIGRATE and ONeSAMP, and the gray area encompasses the 95% confidence intervals for both estimates.

Mentions: We calculated point estimates for the mean dispersal distance per generation (σ) from MIGRATE and ONeSAMP, with confidence limits common to both programs. The point estimate on σ from MIGRATE was 101 km (95% CI in 6.3, 184) and from ONeSAMP was 8.2 km (95% CI in 5.8, 125) (Fig. 4).


Evaluation of rockfish conservation area networks in the United States and Canada relative to the dispersal distance for black rockfish (Sebastes melanops).

Lotterhos KE, Dick SJ, Haggarty DR - Evol Appl (2013)

Contour lines represent the standard deviation of dispersal per generation, as a function of effective density and the Isolation by distance slope. The point estimates are shown for MIGRATE and ONeSAMP, and the gray area encompasses the 95% confidence intervals for both estimates.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3927886&req=5

fig04: Contour lines represent the standard deviation of dispersal per generation, as a function of effective density and the Isolation by distance slope. The point estimates are shown for MIGRATE and ONeSAMP, and the gray area encompasses the 95% confidence intervals for both estimates.
Mentions: We calculated point estimates for the mean dispersal distance per generation (σ) from MIGRATE and ONeSAMP, with confidence limits common to both programs. The point estimate on σ from MIGRATE was 101 km (95% CI in 6.3, 184) and from ONeSAMP was 8.2 km (95% CI in 5.8, 125) (Fig. 4).

Bottom Line: We used isolation-by-distance theory to estimate the scale of dispersal from microsatellite data in the black rockfish, Sebastes melanops, and compared this estimate with the distance between RCAs that would protect this species.Within each country, we found that the distance between RCAs was generally within the confidence intervals of mean dispersal per generation.The distance between these two RCA networks, however, was greater than the average dispersal per generation.

View Article: PubMed Central - PubMed

Affiliation: Department of Zoology, University of British Columbia Vancouver, BC, Canada.

ABSTRACT
Marine reserves networks are implemented as a way to mitigate the impact of fishing on marine ecosystems. Theory suggests that a reserve network will function synergistically when connected by dispersal, but the scale of dispersal is often unknown. On the Pacific coast of the United States and Canada, both countries have recently implemented a number of rockfish conservation areas (RCAs) to protect exploited rockfish species, but no study has evaluated the connectivity within networks in each country or between the two countries. We used isolation-by-distance theory to estimate the scale of dispersal from microsatellite data in the black rockfish, Sebastes melanops, and compared this estimate with the distance between RCAs that would protect this species. Within each country, we found that the distance between RCAs was generally within the confidence intervals of mean dispersal per generation. The distance between these two RCA networks, however, was greater than the average dispersal per generation. The data were also consistent with a genetic break between southern Oregon and central Oregon. We discuss whether additional nearshore RCAs in southern Oregon and Washington would help promote connectivity between RCA's for shallow-water rockfishes.

No MeSH data available.